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. 2006 Feb 8;4:7. doi: 10.1186/1477-7819-4-7

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Copyright © 2006 Koljonen; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Immunohistochemical staining of primary Merkel cell carcinoma for differential diagnosis and neuroendocrine differentiation. A. Hematoxylin-eosin staining, the tumour cells have round nuclei, original magnification 200×. B. Positive cytokeratin-20 staining, showing typical punctate pattern of immunostaining, original magnification 400×. C. Negative staining for Thyroid-transcriptor factor-1, original magnification 400×. D. chromogranin -A staining, original magnification 400× and E. synaptophysin staining, original magnification 400×.